The STM-1 (Synchronous Transport Module level-1) is the SDH ITU-T fiber optic network transmission standard. Higher levels go up by a factor of 4 at a time: the other currently supported levels are STM-4, STM-16, STM-64 and STM-256. Above STM-256. This article compares the capacity and speed of STM0, STM1, STM4, STM16, STM64, and STM256. Adaptors FC and ST are also supplied. 1643 AMS: All optical interfaces are available as SFPs (Small Form-Factor Pluggable Optics) for STM-1 transmission only. Note that the 1643 AM supports S1. 1 and. Cisco Smart SFPs enable applications such as TDM over Packet, migration and integration of Transport Networks into Packet Switching Networks, interoperability with any standard SAToP equipment, and aggregation of SONET/SDH links. These Smart SFPs can operate with Cisco's HD CEM solution on the. Small Formfactor Plugables (SFP) are the successor of the GBIC optics and are currently the most widespread plugable optics on the market. Depending on the cable type (multimode or single-mode fiber), wavelength (850 nm, 1310 nm, 1550 nm or CWDM/DWDM) and data rate, the SFPs are available in. REACH is a European Union regulation concerning the Registration, Evaluation, Authorization and Restriction of Chemicals. The regulation aims to protect human health and.